Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and cash equivalents	$ 11,544	$ 17,672
Restricted cash	181	163
Short-term investments	6,451
Accounts receivable, net	718	2,585
Inventories	3,030	8,000
Other inventory supplies	837	1,486
Prepaid expenses and other current assets	270	1,082
Assets held for sale	11,202	14,761
Total current assets	34,233	45,749
Property and equipment, net	815	7,110
Other assets		154
Total assets	35,048	53,013
Liabilities and stockholders' equity
Accounts payable	582	948
Accrued payroll	101	182
Accrued and other current liabilities	430	602
Corporate income and franchise taxes	294	568
Accrued real estate taxes	249	241
Advance payments	59	23
Total current liabilities	1,715	2,564
Commitments and contingencies
Stockholders' equity
Preferred stock, $0.001 par value, 5,000,000 undesignated shares authorized, no shares issued or outstanding
Common stock, $0.001 par value 8,200,000 shares authorized; 2,910,334 and 2,860,367 shares issued; 2,732,850 and 2,682,883 shares outstanding	29	29
Additional paid-in capital	375,611	374,903
Treasury stock, at cost, 177,484 shares	(12,148)	(12,148)
Accumulated other comprehensive loss	(3)	(30)
Accumulated deficit	(330,156)	(312,305)
Total stockholders' equity	33,333	50,449
Total liabilities and stockholders' equity	$ 35,048	$ 53,013